21000201012018 has 48 divisors (see below), whose sum is σ = 46365215210496. Its totient is φ = 6868028076480.

The previous prime is 21000201012013. The next prime is 21000201012041. The reversal of 21000201012018 is 81021010200012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21000201012013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41586430 + ... + 42088377.

It is an arithmetic number, because the mean of its divisors is an integer number (965941983552).

Almost surely, 2^{21000201012018} is an apocalyptic number.

21000201012018 is an abundant number, since it is smaller than the sum of its proper divisors (25365014198478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000201012018 is a wasteful number, since it uses less digits than its factorization.

21000201012018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83675079 (or 83675076 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The spelling of 21000201012018 in words is "twenty-one trillion, two hundred one million, twelve thousand, eighteen".